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DISTANCE!!!!
Yes, it is always positive. 0 K is the lowest temperature there can be.
It is because many things are measured with reference to a fixed point: it space or time. This point is called a reference point or origin.
The locus of a moving point so that it is equidistant from another fixed point (i.e. the distance between them is always constant) is a circle.
If your point is positive positive it is in 1. If tour point is negative positive it is in 2. If your point it negative negative it is in 3. And if your point it positive negative it is in 4.